G S Rehill's Interactive Maths Software Series - "Building a Strong Foundation in Mathematics" from mathsteacher.com.au.

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Year 8 Interactive Maths - Second Edition


Application of Percentages

Percentages are often used for calculations involving money in daily life.  The prices of most quantities increase (or decrease) by a percentage over time.  The changes in prices are often reported in newspapers as a percentage increase (or decrease).  Profit, loss, discount, commission and rates of interest can all be expressed as percentages.


Percentage Increase

Example 10

The price of a calculator increases from $15 to $18.  Express this increase as a percentage of the old price.

Solution:

 

Study Another Topic in Chapter 8: Consumer Arithmetic

[ Percentages ] [ Converting a Percentage to a Decimal ] [ Converting a Fraction or Decimal to a Percentage ] [ Finding a Percentage of a Quantity ] [ Expressing One Quantity as a Percentage of Another Quantity ] [ Application of Percentages ] [ Percentage Decrease ] [ Profit ] [ Loss ] [ Discount ] [ Commission ] [ Problem Solving Unit ] [ Projects ] [ Symbols ] [ Index ]

 
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